Garden Calculator

When to plant, by county

Seed-start, transplant, and harvest dates estimated from your county's average frost dates.

❄ Last frost ~May 23ZONE 3BFirst frost ~Sep 18 ❄
JanAprJulOct

Alliums

CropStart indoorsPlant outsideEst. harvest
Onion

Start seeds very early indoors. Patterson stores 10-12+ months.

Mar 21May 9Aug 17

Early Greens & Cool Season

CropStart indoorsPlant outsideEst. harvest
Peas

Direct sow as soon as soil is workable; handles light spring frosts.

—Apr 25Jun 24
Spinach

Cold-hardy; great for continuous early cuts before heat sets in.

—Apr 25Jun 9
Radishes

25-30 day turnaround; good for fast row intercropping.

—Apr 25May 23
Lettuce

Direct sow or start plugs; harvest outer leaves continuously.

—May 2Jun 16
Kale

Exceptionally frost-tolerant; sweetens with fall frost.

—May 2Jun 26
Swiss Chard

Extremely productive spring through hard frost; cut-and-come-again.

—May 16Jul 10

Brassicas

CropStart indoorsPlant outsideEst. harvest
Broccoli

Reliable spring-to-summer transition crop.

Apr 11May 9Jul 8
Cauliflower

Mulch well to keep roots cool and prevent early buttoning.

Apr 11May 16Jul 15

Root Crops & Tubers

CropStart indoorsPlant outsideEst. harvest
Carrots

Storage types (Bolero, Bangor) need loose, well-draining soil.

—May 9Jul 18
Beets

Thinnings make tender salad greens.

—May 9Jul 11
Potatoes

Plant seed pieces 4in deep; hill soil as green growth rises.

—May 9Aug 7

Solanaceous (Warm Season)

CropStart indoorsPlant outsideEst. harvest
Tomato

Slicers/heirlooms — sturdy cages or trellises required.

Apr 11Jun 13Aug 22
Cherry Tomato

Sun Gold and Juliet are high-yield, crack-resistant standards.

Apr 11Jun 13Aug 9
Paste Tomato

Dense flesh for sauces; San Marzano and Roma VF yield heavily.

Apr 11Jun 13Aug 26
Pepper

Excel in containers, on blacktop, or 2 per cage for warmth/shade.

Mar 28Jun 13Aug 19
Eggplant

Use bottom heat mats for germination.

Mar 28Jun 13Aug 22

Legumes & Corn

CropStart indoorsPlant outsideEst. harvest
Bush Beans

Sow once soil is reliably warm (60°F+).

—Jun 13Aug 7
Pole Beans

Trellis 6-8ft; heavy producers until first hard frost.

—Jun 13Aug 14
Sweet Corn

Plant in blocks (min. 4x4 grid), not single rows, for pollination.

—Jun 13Aug 30

Cucurbits (Summer)

CropStart indoorsPlant outsideEst. harvest
Cucumber

Trellis vines for straight, clean fruit.

—Jun 13Aug 4
Summer Squash

Choose PM-resistant types (Green Machine) to avoid late mildew.

—Jun 13Jul 23

Cucurbits (Winter & Storage)

CropStart indoorsPlant outsideEst. harvest
Winter Squash

Butterbush is compact and quick-ripening; cure in sun before storage.

May 9Jun 13Sep 26cutting it close
Pie Pumpkin

New England Pie and Sugar Baby bred for dense, non-stringy flesh.

May 16Jun 13Oct 10cutting it close
Carving Pumpkin

Needs 50-100 sq ft per hill.

May 16Jun 13Oct 15cutting it close
Gourds

Long season (100+ days); harvest after first light frost and cure indoors.

May 16Jun 13Oct 20cutting it close

Melons

CropStart indoorsPlant outsideEst. harvest
Cantaloupe

Plant into black plastic mulch/fabric to raise root temps 5-10°F.

—Jun 20Sep 9cutting it close
Watermelon

Blacktail Mountain is bred for cold nights and short summers.

—Jun 20Sep 14cutting it close
Honeydew

Earli-Dew matures 2-3 weeks faster than standard honeydew.

—Jun 20Sep 19cutting it close

Garlic isn't listed here — it's planted in fall for a next-summer harvest, so it doesn't fit a last-frost-based calculator. See the Grow Guide for garlic planting notes.